Valve Stem Failure.....

[Blue Bayou]

YES, it's possible. There's a video on You-tube where a guy's Busa on the Dyno blows a rear valve stem, NOT pretty...!!
I went out to fire up my Busa this morning for a trip to the petrol station and after straddling her and trying to move backwards to no avail, I came to the conclusion she had a flat tire. I checked the entire tread area on the flat rear tire and found nothing. I then took my valve stem tool and gently tried to tighten the valve core itself. Well dang, it MOVED. I kept gently twisting it for a few more seconds and POW, the entire metallic valve mechanism blew off into my hand. After looking it over carefully, I realized that the valve assembly had become unbonded and had blown out of the rubber part. Good thing it had not happened whilst I was out riding in the boondocks...!!!
So to make the story short, I took it to a place that fixes motorcycle tires and they put a new valve stem in it for the measely sum of 38 bucks. BOY, what a bargain..!!! That was AFTER I removed the rear wheel and brought it in to them. I guess nothing's cheap in Florida..!!!
So in the 96 degree heat, I got it all back together and adjusted and she's ready for the grand voyage to the petrol station in the morning.
So, in parting Bros, my advice to everyone is to periodically examine your valve stems with a tug and twist to make sure they are still sound and in good shape.
I am including a photo to show you the separated valve assembly.
BB

 

[dadofthree]

 

[c10]

Replace with every tire change for me . They are less than .50 cents purchased in bulk . FYI get the super short one because the longs with speeds of 100 mph or more will tear after time causing a leak . I carry an extra , and fish tool for others for road side replacement . I have had to do it at a few rallies over the years

 

[Blue Bayou]

Replace with every tire change for me . They are less than .50 cents purchased in bulk . FYI get the super short one because the longs with speeds of 100 mph or more will tear after time causing a leak . I carry an extra , and fish tool for others for road side replacement . I have had to do it at a few rallies over the years

Yes, that's the way I have always operated, replace with every tyre change. I guess I should have checked the stem when I got the bike but it slipped my mind. I DID get the short stem, he only had a choice of two sizes. :-)
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[mabupa]

Just get the metal 90' stems and you won't have to worry about it again.

 

[13013]

Just get the metal 90' stems and you won't have to worry about it again.

Whoa! 90 foot? Ok if you say so I'll try it.

 

[Narcissus]

I'm going to have to check mine when I finally get back. Haven't ridden in three years and it's been 5~6 years since the last set change.

 

[Blue Bayou]

I think I figgered out what facilitated the metal part to come loose from the rubber part. I believe it was chain lube sling off.
As I'm sure most of you know, oil and rubber don't play well together. I think the lube softened the rubber and then tightening down the valve stem cap probably twisted it a bit til it worked it's way out. When I tightened the core it turned just a couple more times and then it popped out.
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[Blackmax]

Like said before 90" metal racing valve stem NHRA approved ! so they cost a little more how cheap can a person be ?

 

[RedBull]